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Mixed linear complementarity formulation of discontinuous deformation analysis

机译:不连续变形分析的混合线性互补公式

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摘要

In the classical Discontinuous Deformation Analysis (DDA) the contact conditions are enforced by what is referred to as open-close iteration. The open-close iteration involves repeatedly fixing and removing the artificial springs between blocks in contact and thus falls into the category of trial-and-error solution procedures that cannot guarantee the solution is always convergent. Meanwhile, improper stiffness parameters of the artificial springs might cause numerical problems. In order to avoid the introduction of the artificial parameters and to avoid the open-close iteration, this study reformulates DDA as a mixed linear complementarity problem (MLCP). Then, the Fisher-Burmeister Line Search Algorithm (FBLSA) is modified to solve MLCP. Some typical examples including those originally designed by the DDA inventor are reanalyzed, proving the procedure is feasible. (C) 2015 Elsevier Ltd. All rights reserved.
机译:在经典的不连续变形分析(DDA)中,接触条件是通过所谓的“开-闭”迭代来强制执行的。开闭迭代涉及反复地固定和移除接触的块之间的人造弹簧,因此属于试错法过程的范畴,该过程不能保证解法总是收敛的。同时,人造弹簧刚度参数不合适可能会引起数值问题。为了避免引入人工参数并避免开闭迭代,本研究将DDA重新设计为混合线性互补问题(MLCP)。然后,修改了Fisher-Burmeister线搜索算法(FBLSA)以解决MLCP。重新分析了一些典型示例,包括那些最初由DDA发明人设计的示例,证明了该程序是可行的。 (C)2015 Elsevier Ltd.保留所有权利。

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